JPH0634646B2 - Coupling device for tractor and work equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coupling device for a tractor and a working machine.

(Prior Art) When a work machine such as a rotary tiller is connected to a rear part of a tractor so as to be vertically movable and detachable via a three-point link mechanism composed of a central top link and a pair of left and right lower links. A technique for facilitating this connecting work is disclosed in Japanese Patent Laid-Open No. 60-259104.

In the above-mentioned one, the tiller side end portions of the top link and both lower links are connected by the connecting body, and the connecting body is engaged with the upper part and the left and right side portions of the tiller so as to be disengageably engaged. -A blocking device is provided that has a lower connecting portion and releasably prevents the upper and lower connecting portions from being disengaged from the tilling device.

However, in the above, the connection of the tractor, the PTO shaft, and the input shaft of the tiller is a heavy work and a difficult work because a worker lifts the universal joint to fit each shaft. .

Therefore, the equipment cylinder is swingably supported on the connecting body through the joint support vertically and horizontally, and the elastic member for aligning is provided between the joint support and the equipment cylinder, and the yoke of the universal joint is attached to the equipment cylinder. A technique has been developed in which the yoke is fitted to the input shaft while being rotatably supported and connecting the connecting body and the tiller.

This improved technique, as shown in FIG. 8, by engaging the upper connected portion 26 of the cultivating device 7 to the upper connecting portion 27 of the connecting body 6 and moving the cultivating device 7 to the connecting body 6 in a perspective manner, The lower connecting portion 31 and the lower connected portion 32 are connected to each other, and at the same time, the input shaft 10 is inserted into and removed from the equipment cylinder 46 while the swinging movement of the equipment cylinder 46 is accompanied. Also, the equipment cylinder
An elastic member 46 is provided between the joint support 46 and the input shaft so as to be restored from the swinging posture and concentric with the input shaft.

(Problems to be solved by the invention) By the way, in the case of a working machine such as a tiller, the working machine rises even while working in consideration of its size, working height, PTO shaft height of the tractor to be mounted, and the like. The arrangement of the input shaft 10 is determined so that the universal joint can rotate smoothly even in the retracted position, and the shaft center 53 of the input shaft 10 has a direction of engagement and disengagement between the lower coupling portion 31 and the lower coupled portion 32 ( It is not necessarily parallel to the engagement center line 33) of the lower coupled portion 32, and is inclined downward or upward with respect to the engagement / disengagement direction.

Therefore, at the time of fitting / removing the yoke and the input shaft 10, which are performed by moving the working machine 7 near and far around the upper coupled portion 26, particularly at the time of disengagement, even if the equipment cylinder 46 can be swung, the shaft is not fully engaged. Since the angle of the core is different, the yoke may be twisted with respect to the input shaft and may be difficult to separate.

Further, when the working machine is disengaged from the coupling body, the lower coupled portion may be firmly fitted to the lower coupling portion, and the weight of the working machine may be added, which makes it difficult to detach the working machine.

(Problems to be Solved by the Invention) The present invention, between the joint support 45 and the equipment cylinder 46,
When removing the yoke 55 from the input shaft 10 of the work machine 7, a cylinder equipped with the joint support 45 in the inclination direction of the input shaft 10.
By providing the tilting member 57 that tilts 46,
When the yoke 55 is fitted to the input shaft 10, the joint support 45 is kept close to the working machine 7 against the elastic member 52 that presses the equipment cylinder 46 toward the working machine 7 side. The above-mentioned various problems can be solved.

That is, the first concrete configuration of the problem solving means in the present invention is to form the upper connecting portion 27 and the lower left and right connecting portions 31 on the connecting body 6 mounted on the tractor 1 via the three-point link mechanism 4, The upper connecting portion 26 that is detachably connected to the upper connecting portion 27 of the machine 7, and the left and right of the upper connecting portion 26 that is connected to and disengaged from the lower connecting portion 31 when the working machine 7 moves toward and away from the connecting body 6. The lower connected portion 32 is formed, and one of the lower connecting portion 31 and the lower connected portion 32 is provided with retaining means 37 for preventing the other from coming off, and a joint support 45 is vertically arranged at the intermediate portion of the connecting body 6. The joint support 45 supports the equipment cylinder 46 so that it can swing vertically and horizontally, and the equipment cylinder 46 supports the tractor PT.
A yoke 55 of a universal joint 8 that interlocks and connects the O shaft 9 and the work implement input shaft 10 is rotatably supported, and the equipment cylinder 46 is pressed between the joint support 45 and the equipment cylinder 46 toward the work machine 7 side. In addition to providing the elastic member 52 for centering,
Left and right lower connection with the yoke 55 removed from the input shaft 10.
An input shaft inclined with respect to the engagement / disengagement direction between the 31 and the lower coupling portion 32
The inclination member 57 for inclining the equipment cylinder 46 with respect to the joint support 45 is provided in substantially the same direction as the inclination direction of 10. In the second specific configuration, the tractor 1 is provided with the three-point link mechanism 4 interposed therebetween. The upper connecting portion 27 and the left and right lower connecting portions 31 are formed on the attached connecting body 6, and the upper connected portion 26 that is detachably connected to the upper connecting portion 27 and the upper connected portion 26 are connected to the working machine 7. The lower connecting portion 31 and the left and right lower connected portions 32 that are engaged and disengaged by the movement of the working machine 7 relative to the connecting body 6 are formed.
31 and a lower connecting portion 32 are provided with a retaining means 37 for preventing the other from coming off, and a joint support 45 is supported at an intermediate portion of the connecting body 6 so as to be vertically movable.
The equipment cylinder 46 is rotatably supported in the vertical and horizontal directions on the 45, and the yoke 55 of the universal joint 8 connecting the tractor PTO shaft 9 and the working machine input shaft 10 is rotatably supported on the equipment cylinder 46. Between the joint support 45 and the equipment cylinder 46, an elastic member 52 for elastically pressing and aligning the equipment cylinder 46 toward the working machine 7 side is provided, and the left and right lower connecting portions 31 with the yoke 55 separated from the input shaft 10 are provided. And an inclining member for inclining the equipment cylinder 46 with respect to the joint support 45 in substantially the same direction as the inclining direction of the input shaft 10 inclined with respect to the engagement / disengagement direction of the lower coupled portion 32.
57, the upper and lower connecting portions 27, 31 are connected to the upper and lower connected portions 26, 32 and the yoke 55 is connected to the input shaft 10, and the tilting member 57 is provided between the joint support 45 and the equipment cylinder 46. That is, a gap 13 is formed to release the action and to move the equipment cylinder 46 to the working machine 7 side.

(Operation) When the connecting body 6 of the tractor 1 is moved closer to the working machine 7 and is raised by the three-point link mechanism 4, the upper connecting portion 27 engages with the upper connected portion 26, and the working machine 7 is moved forward. Then, the left and right lower connected portions 32 of the working machine 7 that are lifted up are brought closer to and engaged with the lower connecting portion 31, and the retaining means 37 is actuated to move the lower connected portion 32.
Is prevented from leaving.

At the same time as this connecting operation, the yoke 55 in the equipment cylinder 46 is fitted to the proper position of the input shaft 10 with the swinging movement and up-down movement of the equipment cylinder 46 with respect to the joint support 45. Even after the yoke 55 is completely fitted to the input shaft 10, the connecting body 6 is approaching the working machine 7 so as to fully engage the lower connecting portion 31 with the lower connected portion 32, and abuts on the working machine 7. The joint support 45 approaches the working machine 7 side against the elastic member 52 with respect to the equipment cylinder 46 that has become immobile, and the lower connecting portion 31 and the lower connected portion 32 are provided.
When and are fully engaged, the joint support 45 and the equipment cylinder
Between the 46 forms the gap l ₃ to movable equipment cylinder 46 in direction of action of the elastic member 52. As a result, the equipment cylinder 46 does not receive the tilting movement of the tilting member 57, and the elastic member
The yoke 55 is held concentrically with the input shaft 10 by the aligning action of 52.

When the working machine 7 is lifted by the three-point link mechanism 4 when the working machine 7 is detached from the tractor 1, the lower part of the working machine 7 is elastically pressed by the action force of the elastic member 52 in a direction away from the connecting body 6. This helps the lower coupled portion 32 to separate from the lower coupling portion 31 when the retaining means 37 is released.

When the withdrawal operation is started, the eliminated clearance l _3, inclined member 57 acts, is tilted to the input shaft inclination direction equipment cylinder 46 via the elastic member 52 which has been equipped cylinder 46 two centering action Further, with the vertical movement of the joint support 45 with respect to the connecting body 6, the pull-out resistance of the yoke 55 with respect to the input shaft 10 is reduced, and a smooth detaching operation is performed.

(Example) Hereinafter, the Example of this invention is described based on drawing.

In FIGS. 5 and 6, a three-point link mechanism 4 including a top link 2 and left and right lower links 3 is attached to the rear part of the tractor 1, and is vertically movable via a hydraulic device 5.
A connecting body 6 is attached to the rear end of the point link mechanism 4, and the working machine 7 exemplified by the rotary cultivator is detachably connected to the connecting body 6, and the work machine input from the tractor PTO shaft 9 through the universal joint 8. Power can be transmitted up to axis 10.

The connecting body 6 has an inverted U-shaped upper bracket 13 fixed to the central upper portion of a frame 12 having a mountain shape in front view, a lower bracket 14 fixed to the left and right lower side portions, and a mounting bracket 15 fixed to the middle portion. There is. The top bracket 13 has a top link connecting pin.
16, lower left and right lower brackets 14 are provided with lower link connecting pins 17 in a protruding manner.

In the working machine 7, a gear case 20 is arranged in the upper center of a machine frame 19, a support arm 21 is projected left and right from the gear case 20, and a mast member 22 is provided on the upper part. A receiving bracket 23 is provided on the left and right support arms 21 so as to project forward,
A mast support 24 is installed between the receiving bracket 23 and the upper portion of the mast member 22.

A pin that can be connected to the top link 2 is provided on the upper portion of the mast member 22 to form an upper connected portion 26. Here, the upper connected portion 26 is an upper connecting portion 27 formed on the upper bracket 13 side. It is connected to and detached from.

The upper connecting portion 27 is a stopper 28 fixed to the upper bracket 13,
It has a hook member 29 pivotally supported by the connecting pin 16 and an arcuate attracting hook 30 provided on the top link 2, and the attracting hook 30 is applied to the upper coupled portion 26 from below. Then, the upper coupled portion 26 is pulled toward the coupling body 6 until it comes into contact with the stopper 28, and in that state, the hook member 29 is rotated to engage with the upper coupled portion 26, whereby the upper coupling portion 27 And the upper connected portion 26 are connected. The upper connecting portion 27 can be formed only by providing the upper bracket 13 with a recess for receiving the upper connected portion 26 from below.

The lower link connecting pin 17 penetrates the lower bracket 14 and projects to both sides, the lower link 4 is connected to one side, and the lower connecting portion 31 is formed on the other side. The lower connecting portion 31 is a receiving bracket. It is releasably connected to the lower connected portion 32 formed in 23.

The lower coupling portion 32 is formed of a front open recess 32a,
With the upper coupled portion 26 engaged with the upper coupling portion 27, the coupling body 6
With respect to the work machine 7 moving relatively far,
The recess 32a is engaged with and disengaged from the connecting pin 17. The center line 33 of the recess 32a is substantially aligned with the engagement / disengagement direction. This recess centerline 3
The axis 34 of the input shaft 10 is inclined with respect to 3 by an angle 35, and in FIG. 5, the inclination direction is forward and downward.

The left and right receiving brackets 23 are provided with retaining means 37. The retaining means 37 is provided with a pair of plate bodies 38 and 39 on the receiving bracket 23, a tubular body 40 is fixed to the upper plate body 38, and the tubular body 40 is projected toward the lower plate body 39 to form a recess. A lock pin 41 for retaining the connecting pin 17 engaged with the 32a is arranged so as to be movable up and down, a spring 42 for urging the lock pin 41 downward, and a recess of the connecting pin 17 for holding the connecting pin 17 in the retracted position.
A sensing body 43 for sensing insertion into 32a is provided. The lock pin 41 is artificially pulled up and held at the retracted position by the sensing body 43, and the coupling pin 17 enters the recess 32a of the lower coupling portion 32 and pushes the sensing body 43 to hold the lock pin. Is released, the lock pin 41 projects toward the front side of the connecting pin 17 by the spring 42, and prevents the lower connecting portion 31 from coming off.

The lower connecting portion 31 may be formed on the working machine 7 side, and the lower connected portion 32 may be formed on the connecting body 6, respectively.

1 to 5, a mounting bracket at the center of the connecting body 6
Joint support 45 is attached to 15 in a hanging shape,
An equipment cylinder 46 is supported on the joint support 45 so as to be swingable.

Joint support 45 has two vertical holes 47 in the upper two places.
It is supported by the mounting bracket 15 so that it can move up and down by a bolt 48 that penetrates this long hole 47, a collar 49 is fitted to the bolt 48, and the joint support 45 is not tightened with bolts and nuts. , Joint support
The lower part of 45 and the equipment cylinder 46 are allowed to swing back and forth. Although the joint support 45 is located on the front surface of the mounting bracket 15, it may be arranged on the rear surface side.

The equipment cylinder 46 is penetrated through the circular hole 50 in the lower part of the joint support 45, the countersink 51 is fitted to the front part of the outer periphery of the equipment cylinder 46, and the flange part 46a is integrally formed at the rear part. An elastic member 52 is provided between the flange portion 46a and the joint support 45. The elastic member 52 is formed of a coil spring fitted in the equipment cylinder 46,
When the equipment cylinder 46 is swung up and down and left and right (pivoting motion), it is restored so that the axis 53 of the equipment cylinder 46 is orthogonal to the joint support 45, that is, it is concentric or parallel to the circular hole 50. It plays the role of centering for.

A yoke 55 at the rear end of the universal joint 8 is concentrically and rotatably supported in the equipment cylinder 46 via a bearing 56, and the yoke 55 is removably fitted to the input shaft 10. To be done.

At the front of the joint support 45, the axis of the equipment cylinder 46
An inclination member 57 is provided at a position displaced upward by 53 from the dimension 53. The inclined member 57 is formed by welding a round bar, a triangular bar, or the like, and is capable of abutting on the countersunk 51. The elastic cylinder 52 elastically presses the equipment cylinder 46 to the rear side to contact the countersunk 51. Tilt the equipment cylinder 46 forward and downward as shown in FIG. This inclination angle is equal to or close to the inclination angle 35 of the input shaft 10 with respect to the lower coupling portion 32, and in that state, the aligning function of the elastic member 52 with respect to the equipment cylinder 46 is lost. The restoring action to return to is working.

The inclination member 57 is provided on the left and right, but the equipment cylinder 46
One may be arranged directly above, or may be provided on the countersunk 51. Further, when the input shaft 10 of the work machine 7 is inclined forward and upward with respect to the attachment / detachment direction of the lower coupled portion 32 (the direction of the substantially center line 33), the inclination member 57 is arranged below the shaft core 53. hand,
The equipment cylinder 46 is configured to tilt forward and upward, which is the tilt direction of the input shaft 10.

The flange portion 46a of the equipment cylinder 46 projects rearward from the yoke 55 and can contact the front surface of the gear case 20, and the yoke 55 is substantially attached to the input shaft 10 when the equipment cylinder 46 is in contact with the gear case 20. It will be in a completely fitted state. When the equipment cylinder 46 contacts the gear case 20, the yoke 55 and the input shaft 10
It is possible to prevent rainwater, dust, etc. from entering the room.

The yoke 55 and the equipment cylinder 46 are completely fitted to the input shaft 10,
When the countersink 51 is in contact with the inclined member 57, the connecting pin 17 is not completely inserted into the recess 32a, and the connecting pin 17
The joint support 45 is configured to move in the axial direction relative to the elastic member 52 until it is completely inserted into the recess 32a. When the lower connecting part 31 is completely connected to the part 32, a gap 12 larger than the size of the tilting member 57 is formed between the joint support 45 and the countersunk 51, and thus the tilting member 57 and the countersunk.
A gap 13 for allowing the equipment cylinder 46 to move in the acting direction of the elastic member 52 is formed between the equipment cylinder 51 and the equipment cylinder 51, and thus, the equipment cylinder 46.
Is uniformly contacted with the gear case 20 over the entire circumference without being affected by the inclination member 57, the centering function of the elastic member 52 works, and the twisting of the yoke 55 and the input shaft 10 does not occur. Further, since the elastic member 52 is given a preload in the direction of moving the working machine 7 away from the connecting body 6, when the lock pin 41 is released,
The lower connected portion 32 and the lower connecting portion 31 are separated from each other.

Since the circular hole 50 of the joint support 45 is formed to have a large diameter to allow the swing of the equipment cylinder 46, the equipment cylinder
46 may be located directly below the circular hole 50, and in order to prevent this and align the axis of the equipment cylinder 46 with the center of the circular hole 50, between the equipment cylinder 46 and the joint support 45 or the circular hole. It is preferable to provide a spring, a cushion or the like for suspending the equipment cylinder 46 in the inside of 50.

FIGS. 6 and 7 show an example of a joint cover 61 surrounding the universal joint 8. Since the distance between the PTO shaft 9 and the input shaft 10 changes as the working machine moves up and down, the universal joint 8 is axially expandable and contractible, and therefore the joint cover 61 is also expandable.

This joint cover 61 is conventionally formed of a double cylinder, but since it covers the universal joint 8, its minimum contraction dimension is shorter than the maximum contraction dimension of the joint shaft. The double cylinder of the cover 61 may come off and separate.

Therefore, the joint cover 61 shown in FIG.
Even if 62 is formed by a bellows that can expand and contract itself, and the end of the bellows is slidably fitted to the inner cylinder 63 so that the outer cylinder 62 is formed in a length that does not separate from the inner cylinder 63, By the modification, the minimum contracted dimension similar to the conventional one can be obtained.

(Effect of the Invention) According to the present invention described in detail above, when the tilt member 57 is provided between the joint support 45 and the equipment cylinder 46, and the yoke 55 is disengaged from the input shaft 10, the equipment cylinder 46 and the yoke. Since the 55 is tilted in the same direction as the tilting direction of the input shaft 10 with respect to the engagement / disengagement direction of the lower connecting portion 31 and the lower connected portion 32, the elastic member 52 is provided in the mounting cylinder.
The force for aligning 46 is released, the twisting of the yoke 55 with respect to the input shaft 10 is reduced, and it can be removed easily and lightly.

Further, with the upper and lower connecting portions 27, 31 and the upper and lower connected portions 26, 32 connected and the yoke 55 connected to the input shaft 10, the equipment cylinder 46 is mounted between the joint support 45 and the equipment cylinder 46. Since the gap l3 that allows the tilt member to move toward the side is formed.
Even if 57 is provided, when the yoke 55 is connected, the centering action of the equipment cylinder 46 by the elastic member 52 works normally, and the force that twists the yoke 55 against the input shaft 10 does not work, so smooth power transmission. In addition, it is possible to assist the detachment of the lower connected portion 32 from the lower connecting portion 31 when the working machine 7 is detached.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a sectional side view of an essential part when a working machine is mounted, FIG. 2 is a sectional side view of an attaching / detaching work, and FIG. 3 is an essential part. Front view, FIG. 4 is a partial cross-sectional side view of an essential part, FIG. 5 is a side view of the entire coupling device, FIG. 6 is a general side view of a working machine mounted on a tractor, and FIG. 7 is a universal joint cover. Sectional view showing an example, No. 8
The figure is an explanatory view showing a conventional improved technique. DESCRIPTION OF SYMBOLS 1 ... Tractor, 4 ... 3-point link mechanism, 6 ... Connection body, 7 ...
Working machine, 8 ... Universal joint, 9 ... PTO shaft,
10 ... Input shaft, 26 ... Upper connected part, 27 ... Upper connected part, 31 ... Lower connected part, 32 ... Lower connected part, 32a ... Recessed part, 37 ... Stopping means, 4
5 ... Joint support, 46 ... Equipment cylinder, 52 ... Elastic member, 5
5 ... Yoke, 57 ... Inclined member.

Claims (2)

[Claims] 1. An upper connecting portion 27 and left and right lower connecting portions 31 are formed on a connecting body 6 attached to a tractor 1 via a three-point link mechanism 4, and the working machine 7 is detachable from the upper connecting portion 27. An upper connected portion 26 connected to the lower connecting portion 26 and a lower connected portion 32 which is engaged and disengaged with the lower connecting portion 31 when the working machine 7 is moved toward and away from the connecting body 6 in a state where the upper connected portion 26 and the lower connected portion 32 are connected to each other. One of the connecting portion 31 and the lower connected portion 32 is provided with a retaining means 37 for preventing the other from coming off, and a joint support 45 is supported at an intermediate portion of the connecting body 6 so as to be movable up and down, and this joint support 45 is equipped with the joint support 45. Cylinder
46 is swingably supported, and a yoke 55 of a universal joint 8 for interlockingly connecting the tractor PTO shaft 9 and the working machine input shaft 10 is rotatably supported to the equipment cylinder 46, and is connected to the joint support 45. An elastic member 52 that elastically presses and aligns the equipment cylinder 46 to the working machine 7 side is provided between the equipment cylinder 46 and the lower left and right connection portions 31 and the lower coupling connection with the yoke 55 separated from the input shaft 10. A tractor and a working machine characterized in that an inclination member 57 for inclining the equipment cylinder 46 with respect to the joint support 45 is provided in substantially the same direction as the inclination direction of the input shaft 10 inclined with respect to the engagement / disengagement direction with the portion 32. Connecting device. 2. An upper connecting portion 27 and left and right lower connecting portions 31 are formed on a connecting body 6 attached to the tractor 1 via a three-point link mechanism 4, and the working machine 7 is detachable from the upper connecting portion 27. An upper connected portion 26 connected to the lower connecting portion 26 and a lower connected portion 32 which is engaged and disengaged with the lower connecting portion 31 when the working machine 7 is moved toward and away from the connecting body 6 in a state where the upper connected portion 26 and the lower connected portion 32 are connected to each other. One of the connecting portion 31 and the lower connected portion 32 is provided with a retaining means 37 for preventing the other from coming off, and a joint support 45 is supported at an intermediate portion of the connecting body 6 so as to be movable up and down, and this joint support 45 is equipped with the joint support 45. Cylinder
46 is swingably supported, and a yoke 55 of a universal joint 8 for interlockingly connecting the tractor PTO shaft 9 and the working machine input shaft 10 is rotatably supported to the equipment cylinder 46, and is connected to the joint support 45. An elastic member 52 that elastically presses and aligns the equipment cylinder 46 to the working machine 7 side is provided between the equipment cylinder 46 and the lower left and right connection portions 31 and the lower coupling connection with the yoke 55 separated from the input shaft 10. An inclination member 57 for inclining the equipment cylinder 46 with respect to the joint support 45 is provided in substantially the same direction as the inclination direction of the input shaft 10 inclined with respect to the engagement / disengagement direction with the portion 32, and the upper and lower connecting portions 27, 31 and the upper and lower portions. With the connected parts 26 and 32 connected and the yoke 55 connected to the input shaft 10, the action of the tilting member 57 is released between the joint support 45 and the equipment cylinder 46, and the equipment cylinder 46 is moved to the working machine 7 side. Gap that makes it possible to move to
A device for connecting a tractor and a working machine, wherein the connecting device is formed.